Question

A hot metal is placed in 100.0 g sample of water and it causes the temperature of the water to increase from 25 C to 27 C. How many joules of energy did the water absorb from the metal?

Answer 1

Answer:
`836.8\ J`

Step-by-step explanation:

Given

Mass of water in the sample is
`m=100\ g`

Temperature changes from
`25^(\circ)C` to
`27^(\circ)C`

Change in temperature is
`\Delta T=27-25=2^(\circ)C\ \text{or}\ 2\ K`

We know, specific heat of water is
`c=4.184\ J/g-K`

Heat absorbed is given by

`\Rightarrow Q=mc\Delta T\\\Rightarrow Q=100* 4.184* 2\\\Rightarrow Q=836.8\ J`

Thus, water absorbs
`836.8\ J` of heat from hot plate.